Question

Difference between flash freezing and freeze drying

Answer 1

Answer:

Flash freezing refers to the process whereby objects are frozen in just a few hours by subjecting them to cryogenic temperatures, or through direct contact with liquid nitrogen at −196 °C (−320.8 °F). When water is supercooled to temperatures below −48 °C (−54 °F), it must freeze.Freeze drying, also known as lyophilisation or cryodesiccation, is a low temperature dehydration process that involves freezing the product, lowering pressure, then removing the ice by sublimation. This is in contrast to dehydration by most conventional methods that evaporate water using heat.